pharmaceutics equations and constants

Molecular weight of NaCl

58.5 g/mole

conversion formula for mEq

conversion formula for mOsmol

E values

equation for isotonicity

steps to use alligation alternate

• Draw a box and write the higher concentration at the top left, while lower concentration at the bottom left, and the desired concentration in the middle.

• Subtract diagonally to find the parts of each solution needed.

• Determine the ratios of solutions

• Calculate the volume of each solution

IBW for males

50kg + 2.3kg*(each inch >5ft)

IBW for females

45.5kg + 2.3kg*(each inch >5ft)

ABW

[(Actual wt – IBW) x (0.4)] + IBW

% over/under IBW

(Actual Wt/IBW) x 100

Cockcroft-Gault (CG) equation for males

Cockcroft-Gault (CG) equation for females

pH of weak acids

pH of weak bases

mass (g) of liquids

g = specific gravity * volume(mL)

syringe accuracy:

if syringe volume < 5mL and syringe is filled to ≥ ½ capacity

±5% of medication volume

syringe accuracy:

if syringe volume < 5mL and syringe is filled to < ½ capacity

±5% of max syringe volume + 2% of medication volume

syringe accuracy:

if syringe volume ≥ 5mL and syringe is filled to ≥ ½ capacity

±4% of medication volume

syringe accuracy:

if syringe volume ≥ 5mL and syringe is filled to < ½ capacity

±1.5% of max syringe volume + 1% of medication volume